This is a really simple procedure in metatrader4 to install custom indicator. We have just need to download an indicator which we want to use in metatrader4. After downloading your file will be added in download folder. Now you have a need to copy or cut from here and go to programme files and then go to Metatrader4 and search open file. When I will be opened you will saw mql4 folder open it and now paste your indicator in the indicators folder. You have successfully installed a custom indicator in your profile.